Drop --vm.Xdock:name option

It is not supported by library launchers any way, at least at the moment.

mx.trufflesqueak/mx_trufflesqueak.py

@@ -222,7 +222,7 @@ def patched_native_image(self, build_args, output_file, out=None, err=None, find
                 '--vm.Xms512M',
                 '--vm.Xss16M',
                 '--vm.-add-exports=java.base/jdk.internal.module=de.hpi.swa.trufflesqueak',
-            ] + (['--vm.Xdock:name=TruffleSqueak'] if mx.is_darwin() else []),
+            ],
         )
     ],
     stability='experimental',